如图所示，有一底面积为S=1000cm²，高1.5m的圆柱形盛水容器中竖直放置一底面积为S=200cm²，高h=20cm的圆柱形物块：己知该物块的密度为ρ=2.5×10³kg/m³，容器中水深H=1.2m．开始时，物块下表面与容器底面间有小空隙，现用如图所示的光滑轻滑轮组拉着物体以v=0.2m/s的速度匀速上升．（取g=10N/kg，不计水的阻力，ρ_水=1.0×10³kg/m³）

    Ben and Jim are twin brothers. They are nine. They are pupils. They study in Yuxin Primary School. They are in the same class. Everyday they go to school and come back together.

    Their teacher, Mrs. Green, says to the pupils. Please write a composition (作文) 'My Mother'.

    Jim is a good boy. He writes the composition at home. But Ben plays football with his friends. The next day Mrs Green says to the class, “I read your compositions today. But two of yours are just the same.” Ben stands up and says, “Jim and I are twins. We have the same mother.”

阅读《记承天寺夜游》，完成小题。

记承天寺夜游

苏轼

    元丰六年十月十二日夜，解衣欲睡，月色入户，欣然起行。念无与为乐者，遂至承天寺，寻张怀民。怀民亦未寝，相与步于中庭。庭下如积水空明，水中藻．荇交横，盖竹柏影也。何夜无月？何处无竹柏？但少闲人如吾两人者耳。